<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>特殊场景this绑定实验</title>
</head>
<body>
    <button>按钮</button>

    <script>
        setTimeout(function(){
            console.log("定时器函数:",this);
        },1000);
        var btnE1=document.querySelector("button");

        btnE1.onclick=function(){
            console.log("btn的点击(onclick):",this);
        };
        btnE1.addEventListener("click",function(){
            console.log("btn的点击(addEventListener):",this);
        });
        var names=["abc","cba","nba"];
        names.forEach(function(item){
            console.log("forEach:",this);
        },"aaaa");
    </script>
</body>
</html>